Hi all,

      I have a question concerning using R to calculate "x" when "f(x)"
reaches its minimum, for example x is between -5 and 5. A simple and naive
method would be divide (-5,5) into 10000 pieces, and then calculate the
corresponding values of f(x)'s. Then the order of those f(x)'s would give
me the answer of "x". However, this method is kind of slow and inaccurate.
I would really appreciate if someone could give me some suggestions of
improving it, or tell me a better method. Thank you.

Best regards,
Tianyu Zhan

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